嗨，我想知道在我提交并出现验证错误后，是否有任何方法可以阻止我的表单被清除？
只是为了澄清我有多个表单，当用户提交时我使用 js 进行验证，当验证错误提醒所有表单重置时，有什么方法可以阻止它？？？“是的，它必须是 javascript”
<script>
//calender dropdown menu
var monthtext=['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sept','Oct','Nov','Dec'];
function populatedropdown(dayfield, monthfield, yearfield,init){
var dayfield=document.getElementById(dayfield);
var monthfield=document.getElementById(monthfield);
var yearfield=document.getElementById(yearfield);
var today=(init)?new Date():new Date(yearfield.value*1,monthfield.value*1)
dayfield.options.length=0;
for (var i=0; i<new Date(today.getFullYear(),today.getMonth()+1,-1).getDate(); i++) dayfield.options[i]=new Option(i+1,i+1)
dayfield.selectedIndex=(init)?today.getDate()-1:0; //select today's day
if (init){
for (var m=0; m<12; m++) monthfield.options[m]=new Option(monthtext[m],m);
}
monthfield.selectedIndex=(init)?today.getMonth():0; //select today's day
if (init){
var thisyear=today.getFullYear()
for (var y=0; y<20; y++) yearfield.options[y]=new Option(thisyear, thisyear++)
}
}
// function validate
function validate_form ()
{
valid = true;
// validate name
if ( document.input.name.value == "" )
{
alert ( "Please enter your name" );
valid = false;
}
// validate address
if ( document.input.address.value == "" )
{
alert ( "Please enter your address address" );
valid = false;
}
// validate suburb town
if ( document.input.town.value == "" )
{
alert ( "Please enter your Suburb or town" );
valid = false;
}
// validate postcode
var y = document.getElementById('postcode').value;
if(isNaN(y)||y.indexOf(" ")!=-1)
{
alert("Postcode must be in numbers.");
document.getElementById('postcode').focus();
return false;
}
if (y.length>4 || y.length<4)
{
alert("Postcode should be 4 digit");
document.getElementById('postcode').focus();
return false;
}
// validate home phone
var y = document.getElementById('hphone').value;
if(isNaN(y)||y.indexOf(" ")!=-1)
{
alert("Home Phone number must be in numbers.");
document.getElementById('hphone').focus();
return false;
}
if (y.length>10 || y.length<10)
{
alert("Home Phone number should be 10 digit");
document.getElementById('hphone').focus();
return false;
}
// validate work phone
var y = document.getElementById('wphone').value;
if(isNaN(y)||y.indexOf(" ")!=-1)
{
alert("work Phone number must be in numbers.");
document.getElementById('wphone').focus();
return false;
}
if (y.length>10 || y.length<10)
{
alert("Work Phone number should be 10 digit");
document.getElementById('wphone').focus();
return false;
}
// validate fax
var y = document.getElementById('fax').value;
if(isNaN(y)||y.indexOf(" ")!=-1)
{
alert("Fax number must be in numbers.");
document.getElementById('fax').focus();
return false;
}
if (y.length>10 || y.length<10)
{
alert("Fax Phone number should be 10 digit");
document.getElementById('fax').focus();
return false;
}
// validate email
{
var x=document.forms["input"]["email"].value;
var atpos=x.indexOf("@");
var dotpos=x.lastIndexOf(".");
if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length)
{
alert("Not a valid e-mail address");
return false;
}
}
{
// validate radio buttons
var o = document.getElementById('1');
var t = document.getElementById('2');
if ( (o.checked == false ) && (t.checked == true ) )
{
// validate alternative address
if ( document.input.street.value == "" )
{
alert ( "Please enter alternative address address" );
valid = false;
}
// validate suburb town
if ( document.input.suburb.value == "" )
{
alert ( "Please enter alternative Suburb or town" );
valid = false;
}
// validate postcode
var y = document.getElementById('postcode2').value;
if(isNaN(y)||y.indexOf(" ")!=-1)
{
alert("Postcode must be in numbers.");
document.getElementById('postcode2').focus();
return false;
}
if (y.length>4 || y.length<4)
{
alert("Alternative Postcode should be 4 digit");
document.getElementById('postcode2').focus();
return false;
}
// validate message box
var o = document.getElementById('card');
if ( (o.checked == true ))
{
if ( document.input.message.value == "" )
{
alert ( "Please enter message" );
valid = false;
}
return valid;
}
}
}
}
</script>
<input type="submit" value="Submit" />